Al Petteway's guitar, Bonnie Rideout's fiddle and Maggie Sansone's hammer dulcimer add up to an evocative folk concert Sunday night at the Kennedy Center (202/467-4600), dubbed "A Scottish Christmas." If you missed Jem Cohen's intriguing documentary of Fugazi, "Instrument," you can see it Monday night at the Black Cat (202-667-7960).

The Rosslyn Mountain Boys were Washington's finest country/rock band in the late '70s and early '80s. Catch a reunion show of those erstwhile contenders Tuesday at the State Theatre (703/237-0300), along with openers hillbilly/rock torchbearers Ruthie & the Wranglers.

On Tuesday, the Birchmere (703/549-7500) is hosting a double bill of local acts you'll be hearing more from over the next few years: Cecilia, the group where the mom and dad back up the three kids (17, 19, 21) in making gorgeous pop music. Opening the show will be 16-year-old Katy Benko, a Herndon resident who keeps winning international vocal competitions. Look for both acts to be on major record labels in 2000. Pianist/singer/songwriter Jon Carroll is best known for his work with Mary Chapin Carpenter and the Starland Vocal Band, but soon he might be known for his talented son Ben, who's a soulful rock singer in the Jagger mold. Father and son will perform Tuesday at Lewie's (301/652-1600), together with bluesy Mary Anne Redmond.

Sunny Sumter is one of Washington's best jazz singers. Hear this young talent Wednesday at Blues Alley (202/337-4141), as she tackles standards and originals with pianist John Hicks. On Thursday, the Birchmere (703/549-7500)hosts its annual tribute to Hank Williams Sr., featuring John Starling, Robin & Linda Williams, Bill Kirchen, Cathy Fink & Marcy Marxer, all being supported by fiddler Mike Stein, bassist Mark Shatz and steel guitarist Dave Giegerich.